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  3. Suppose you want to select a 3-person committee from a group of 9 students. How many ways are there to do this?

Suppose you want to select a 3-person committee from a group of 9 students. How many ways are there to do this?

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问题 Suppose you want to select a 3-person committee from a group of 9 students. How many ways are there to do this?
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答案84
解析 Since the 3 students on the committee are not ordered, you can use the formula for the combination of 9 objects taken 3 at a time, or "9 choose 3":
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